Show Your Work!
Solution A is an 80% acid solution. Solution B is a 30% acid solution.
(a) How many mL of Solution A must be added to 500mL of Solution B in order to produce a 70% acid solution?
(b) How many mL of Solution A and how many mL of Solution B must be combined to form a 100mL solution that is 50% acid?
(c) Is there a combination of Solution A and Solution B that is 90% acid?
(a) , (b) can't answer these unless we know the ml of Solution B
(c) This is impossible.....the strongest possible solution would be a pure solution of A = 80%
There's no way we can get a solution that is 90% acid
OK....here we go .....
(a) Let x be the mL of Solution A that we need
So....we have this equation
.80x + .30 (500) = .70 ( 500 + x) simplify
.80x + 150 = 350 + .70x
.80x - 70x = 350 - 150
.10x= 200 divide both sides by ,10
x = 2000 (mL of Solution A )